Waterproof joint



Aug. 30, 1932. D, MCEACHERN 1,874,565

WATERPROOF JOINT Filed July 10, 1931 7 I" GA /151K111 I I l I A I l l I.

, INVENTOR Dougaldfllfilickm BYmvjia.

ATTOR N EY WITNESS Patented Aug. 30, 1932 DOUGALD MCEACHERN, or Duncan,BRI'iIsfi coLumnrmcnnnna y WATERPROOF Jom'r Application filed July 10,1931'. Serial No. 549,958. 1

My invention relates to improvements in v water-proof joints, and itconsists in the constructions, combinations, and arrangements hereindescribed and claimed.

, In mining operations where explosives, such as dynamite and fuses fordetonating the same are used, it is customary to attach the fuses to adetonating cap. Where the charge is to be used under water or in placeswhere water is liable to accumulate it is very necessary that the jointbetween the fuse and the cap be water-tight. Various attempts have beenmade to render this joint watertight, such as by crimping the cap ontothe fuse or by putting grease over the joint. In crimping the end of thecap over the fuse there is liability of cutting or choking it while theapplication of grease may be knocked off by the concussion of adischarge in a hole in the vicinity.

An object of my invention is to provide a water-proof joint which can beeffected quickly and which will not choke the fuse nor will it beknocked off by an explosion in the vicinity.

A further object ofmy invention is to provide a water-proofing means fora joint which may be quickly applied and which will absolutely preventthe water from entering the joint.

A further object is to provide means for water-proofing a joint of thiskind in which an elastic substance, such as a rubber band, is providedwith a wire terminal that can be wrapped around the fuse and which whenwrapped does not require tying or other means to hold it in position.

Other objects and advantages will appear in the following specification,and the novel features of the invention will be particularly pointed outin the appended claims.

My invention is illustrated in the accompanying drawing forming a partof this application and in which:

Figure 1 is a side view, showing a fuse and a cap completely coveredwith the waterproofing means;

Figure 2 is a similar view, showing the with the water-proofing means;

I Figure 6 is a 'similarview, butshowing This band 1 as will be observed-is elongated tying or-holding-in any other way than joint between thefuse and the cap covered- Figure 3 is a view, showing the waterproofmgmeans in section;

Figure 4 is a perspective View of the water,-

proofing means;

Figure -5-,is a view of a stick ofdynamite,

showing the use of the water-proofing means as a connecting andholdingmeans for afuse and acap which is inserted into 'the stick of dynamite;and 2 the cap and :fuse going directly into the end of the stick ofdynamite. j J] In carrying out my invention Imake'use of a flat band 1,which is preferably of rubber. and is provided at its end with awire 2.This wireis passedthrough one end and istwisted, as shown at 2 Thesubstance of the wire'is such that it is easily bent but remains in the7 position in'whichit is bent, as distinguished The wire 2 is continuedon by winding it, 515? and when it'is wound it has the position shown inFigure 2.vv In this figure it will be observed that the band hasbeenwound so that the different convolutions overlap. In

- winding theband it is stretched and eachcon- 2 i;

volution tends to press-the one below it so that the rubber bandeflectually. hugsthe joint,

. thereby keeping out the-moisture..-

By continuing the winding withthe wire, the latter is twisted around thefuse3, thelwiiendof the wireremaining close tothe fuse so that there isno tendency for the rubber winding to unwrap.

This produces. a-joint which can bevery quickly applied because it doesnot requireL? merely Winding the terminal wire around as stated. 1 I fIn Figure II have shown the cap as well as the fuse wrapped with theyrubberbandif: It is some times advisable to place the cap 'alon side ofthe charge, such as a stick ofdynamite. If the cap is wrapped as shownin Figure 1, it will not only serve as a protection for the jointbetween the fuse 3 and the cap, but it will protect the cap by a softresilient covering when the hole is tamped. It may happen, if a cap isnot thus protected that eit pli liaimck 's itma t tame sion. 7 Y 7' ingmeansiis'ecr'as "a bifidin'g means rather V gletonat ng 1o1nt, of meansfor water-proofing than a water proofing means. In this figure thedynamite stick 7 has an 'angul arly iiiolined opening, into whichitilevQGEYpEA:sixtemifi, this cap being connected with the fuse 3. The bani}1 as 'wnn" 1" *:iibuiid-th? end-of -tliejsfick of clynamite and are);time*wfi fis cafiiezraeam the firs tohold band in position Eli-ifsmakgsan In Ki re 6 proof band covering thejoint, the layers of the bandoverlapping one another,and a'pliable wire attached to one end of theband and wound closely to'hold the band in position.

3. As an proofing and connecting means comprisinga gesilientvgater prpofband, and apliab lewire attached mag -end as are balmy-skid wire beingadapted to remain in any position in shiflqlaa niz-ah .*"Thecombination-of ai-j'oined fuse and article of manufacture, a water th'joint, said means comprising a water-' prqoi; elastic @and govering thejoint, the

layers ot thelband overlapping one another,

; 'an'd3aepliablemireattaclied toxmeend Q1 l band .andiwoundfclosllyaround the; il sevbfi- V V dynamite "'fcii'm' 5 of the? ea it tendstgi'fg tension wire the band'over lapp'ingg 'an d a'apliab le *"cldelito li'o'ld melanin iifpb'siti'on? f= 2. combination of a joinedliiuseand stick long-thawing a'xi'si In *"th stick oif dynainite tightlynap r r'vent the l 1 e combination oia joined fuse and dtofiatifigeapgrafma ns for' water-proofing r a i'iub'b

